707  
NOUS43 KDMX 251600  
PNSDMX  
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-  
081>086-092>097-260400-  
 
PUBLIC INFORMATION STATEMENT  
NATIONAL WEATHER SERVICE DES MOINES IA  
1100 AM CDT THU MAY 25 2017  
   
..CHANGES TO RIVER FORECAST SERVICES IN CENTRAL IOWA
 
 
TO: FAMILY OF SERVICES /FOS/ SUBSCRIBERS, NOAA WEATHER  
WIRE SERVICE /NWWS/ SUBSCRIBERS, EMERGENCY  
MANAGERS, WEATHER INFORMATION NETWORK /EMWIN/  
SUBSCRIBERS, NOAAPORT SUBSCRIBERS, OTHER NATIONAL  
WEATHER SERVICE /NWS/ CUSTOMERS AND PARTNERS, NWS  
EMPLOYEES  
 
FROM: JEFFREY ZOGG  
SENIOR HYDROLOGIST, NWS DES MOINES IA  
 
SUBJECT: CHANGES TO ACTION STAGE, FLOOD STAGE AND FLOOD  
SEVERITY CATEGORIES FOR THE MIDDLE RIVER NEAR  
INDIANOLA IA, EFFECTIVE IMMEDIATELY  
 
...CHANGES TO ACTION STAGE, FLOOD STAGE AND FLOOD SEVERITY  
CATEGORIES FOR THE MIDDLE RIVER NEAR INDIANOLA IA /SITE ID OF  
IDNI4/, EFFECTIVE IMMEDIATELY...  
 
RELOCATION OF THE USGS STREAMGAGE ASSOCIATED WITH NWS RIVER  
FORECAST SERVICES FOR THIS LOCATION HAS NECESSITATED AN IMMEDIATE  
CHANGE TO THE ACTION STAGE, FLOOD STAGE, MODERATE FLOOD STAGE AND  
MAJOR FLOOD STAGE. THESE CHANGES ARE EFFECTIVE IMMEDIATELY SINCE  
THE USGS STREAMGAGE WAS RELOCATED ON MAY 24 2017.  
 
AS HAS BEEN THE CASE FOR IDNI4, FORECASTS AND WARNINGS WILL  
CONTINUE TO BE VALID ALONG THE REACH OF THE MIDDLE RIVER EXTENDING  
FROM CLANTON CREEK NEAR SPRING HILL TO THE DES MOINES RIVER.  
 
THE NWS WILL PROVIDE RIVER FORECASTS WHEN THE OBSERVED OR FORECAST  
STAGES GO ABOVE THE ACTION STAGE. IN ADDITION, THE NWS WILL ISSUE  
RIVER FLOOD WARNINGS AND FOLLOW-UP RIVER FLOOD STATEMENTS WHEN THE  
OBSERVED OR FORECAST STAGES GO ABOVE THE FLOOD STAGE. BELOW ARE  
THE NEW STAGE THRESHOLDS FOR IDNI4, ALONG WITH THE CHANGES FROM  
THE PRESENT VALUES  
 
* ACTION STAGE: 15.5 FT. DECREASE OF 3.5 FT.  
* FLOOD STAGE AND MINOR FLOODING: 19.5 FT. DECREASE OF 3.5 FT.  
* MODERATE FLOODING: 22.5 FT. DECREASE OF 3.5 FT.  
* MAJOR FLOODING: 24.5 FT. DECREASE OF 3.5 FT.  
 
THE MIDDLE RIVER NEAR INDIANOLA IS A REAL-TIME U.S. GEOLOGICAL  
SURVEY /USGS/ STREAMGAGE WHICH PROVIDES STAGE AND DISCHARGE DATA.  
THIS STREAMGAGE HAS A PERIOD OF RECORD BACK TO 1940. IT IS  
MAINTAINED BY THE USGS IOWA WATER SCIENCE CENTER AND IS FUNDED  
COOPERATIVELY BY THE U.S. ARMY CORPS OF ENGINEERS ROCK ISLAND  
DISTRICT, THE IOWA DEPARTMENT OF TRANSPORTATION AND THE USGS WATER  
SCIENCE CENTER IN IOWA CITY.  
 
   
..CONCLUDING REMARKS
 
 
AS WITH OTHER NWS RIVER FORECAST POINTS, RIVER FORECASTS FOR THE  
ABOVE LOCATION WILL BE AVAILABLE ON THE NWS ADVANCED HYDROLOGIC  
PREDICTION SERVICE /AHPS/ WEBSITE. IN ADDITION, RIVER FORECASTS  
FOR THIS LOCATION WILL BE UPDATED AS NEEDED WHILE THE STREAM  
REMAINS AT OR ABOVE THE FORECAST ISSUANCE STAGE. AT A MINIMUM, THE  
RIVER FORECASTS WILL BE UPDATED ONCE PER DAY IN THE MORNING, WHEN  
EITHER THE OBSERVED OR FORECAST STAGE IS AT OR ABOVE THE FORECAST  
ISSUANCE STAGE.  
 
MORE INFORMATION IS AVAILABLE ON OUR WEBSITE AT:  
HTTP://WWW.WEATHER.GOV/DESMOINES .  
 
THE NWS WELCOMES PUBLIC FEEDBACK. IF YOU HAVE ANY QUESTIONS OR  
COMMENTS ON THIS CHANGE, PLEASE CONTACT:  
 
JEFFREY ZOGG  
NATIONAL WEATHER SERVICE FORECAST OFFICE  
9607 NW BEAVER DRIVE  
JOHNSTON IOWA 50131-1908  
 
PHONE 515-270-4501 X493  
 

 
 
ZOGG  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab IA Page Main Text Page